<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="ul">
        <li>1</li>
        <li>2</li>
        <li>3</li>
        <li>4</li>
        <li>5</li>
    </div>
</body>
<script>
    console.log('---');
    const list = document.querySelector('#ul');
    console.log(list);
    // 加事件
    list.addEventListener('click', function(e) {
        console.log('---');
        console.log(e.target.innerHTML);
    });
</script>
</html>
